| 摘要 |
A process for brazing of aluminium magnesium alloys is described applying a flux which comprises KAlF4 or CsAlF4 or both as major constituent. The flux further comprises at least one alkaline or alkaline earth metal compound selected from the group consisting of KAlF4, CsAlF4, Li3AlF6, CaF2, CaCO3, MgF2, MgCO3, SrF2, SrCO3, BaF2, and BaCO3. Preferably the flux comprises or consists of KAlF4, CsAlF4, and Li3AlF6 and optionally contains also BaF2. |
| 主权项 |
1. A process for brazing parts of aluminum alloy comprising equal to or more than 0.5 by weight of magnesium in the interface, the process comprising a step of applying a brazing flux to at least one of the parts to be joined, a step of assembling the parts to be joined and and a step of heating the parts to be joined to a temperature of equal to or higher than 450° C. to provide brazed joint parts, wherein the brazing flux comprises equal to or more than 65% by weight, relative to the total weight of the brazing flux, of a first component and equal to or more than 3% by weight of a second component, relative to the total weight of the brazing flux, with the proviso that the first component and the second component are not identical, and wherein the first component is a monoalkali tetrafluoroaluminate selected from the group consisting of KAlF4, CsAlF4 and mixtures thereof, and the second component is at least one alkaline or alkaline earth metal compound selected from the group consisting of KAlF4, CsAlF4, Li3AlF6, CaF2, CaCO3, MgF2, MgCO3, SrF2, SrCO3, BaF2, BaCO3, and mixtures of two or more thereof. |
